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五年级数学下册3长方体和正方体长方体和正方体的表面积补充习题新人教版.doc

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1长方体和正方体长方体和正方体的表面积下图是一个电冰箱用的塑料抽屉，它的长是 5.6 dm，宽是 4dm，深是 3.5 dm。做 3个这样的抽屉至少需要多少平方分米的塑料板？答案提示：5.64（5.63.543.5）289.6（dm）89.63268.8（dm 2）答：做 3个这样的抽屉至少需要（268.8）平方分米的塑料板。解题思路：由于抽屉没有上面，所以只求 5个面的面积。做 3个这样的抽屉需乘 3。2

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